MartinB said:
Mind you I haven’t read the actual PNAS paper.
can you download it?
http://www.pnas.org/content/early/2013/07/17/1304459110
http://rspb.royalsocietypublishing.org/content/280/1757/20130053.full
If not, this may be a better guide than the Beeb article
http://www.wired.com/wiredscience/2013/02/dolphin-names/
The King and Janik have a few publications on signature whistles, which they refer to as individually distinctive signature whistles and which they consider are used as learned vocal labels (not “names”).
MartinB said:
The main point that ‘signature whistles’ (however interesting they may be) do not function in the same way as human names (and hence it is a bit silly to claim that they do) appears to be sound.
It’s hotly debated among ethologists if these individually specific learned vocal labels are analogous to ‘names’ or are just group identifiers / group calls (https://www.sciencedirect.com/science/article/pii/S0960982206018203?np=y/). Signature whistles (learned from an early age and used for group cohesion) have been noted in different species of cetaceans for a coupla decades now so there’s oodles of publications to peruse, if you like. Two most recent studies by the authors have been concluded by the authors to suggest that they are indeed unique individual identifiers (as opposed to group identifiers), used as labels for others in the groups, and the behavioural pattern is recognition of one’s own signature being whistled, subsequently recognising it as one’s own signature whistle and responding with a ‘it’s me, (insert my signature whistle here)” – all of which hasn’t been noted in other animals. The two most recent publications are an advance in that have managed to plough a decadal time scale database of records and do some of the experimental work as suggested in 2006.